Research Papers

Development of Ink-Particle Flight Simulation for Continuous Inkjet Printers

[+] Author and Article Information
Masato Ikegawa

Hitachi Research Laboratory,
Hitachi, Ltd.,
832-2, Horiguchi,
Hitachinaka, Ibaraki 312-0034, Japan
e-mail: masato.ikegawa.kv@hitachi.com

Eiji Ishii

Hitachi Research Laboratory,
Hitachi, Ltd.,
832-2, Horiguchi,
Hitachinaka, Ibaraki 312-0034, Japan
e-mail: eiji.ishii.qm@hitachi.com

Nobuhiro Harada

Hitachi Industrial Equipment Systems Co., Ltd.,
1-1, Higashitaga-cho 1-chome,
Hitachi, Ibaraki 316-8502, Japan
e-mail: nobuhiro.harada.kb@hitachi.com

Tsuneaki Takagishi

Hitachi Industrial Equipment Systems Co., Ltd.,
1-1, Higashitaga-cho 1-chome,
Hitachi, Ibaraki 316-8502, Japan
e-mail: tsuneaki.takagishi.sh@hitachi.com

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received March 30, 2014; final manuscript received June 27, 2014; published online August 12, 2014. Assoc. Editor: Donggang Yao.

J. Manuf. Sci. Eng 136(5), 051021 (Aug 12, 2014) (7 pages) Paper No: MANU-14-1138; doi: 10.1115/1.4027943 History: Received March 30, 2014; Revised June 27, 2014

A method of simulating ink-particle flight for industrial, continuous inkjet printers (CIJPs) was developed to clarify the factors that influence print distortion. Print distortion is produced by aerodynamic and electric interference between the ink-particles flying from the nozzle onto the print target. The necessary functions to do this, such as the calculation of electrostatic force in the electric field between the electrodes, Coulomb's force from other charged ink-particles, and the drag force in the inkjet stream for many flying ink-particles were added to a Lagrangian method in the software to analyze the fluid dynamics that was used in the simulations. The trajectories of the ink particles flying from the nozzle onto the print target and the air flow caused by them were simultaneously calculated in the simulations. The results from simulations for the velocities and trajectories of the flying ink particles were compared with the experimental ones obtained with a high-speed camera. These simulation results were in good agreement with the experimental ones, and the developed simulation helps to clarify the factors that influence print distortion and to create algorithms that decrease it.

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Fig. 2

Photograph of ink head in experimental CIJP model

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Fig. 3

Relation of drag coefficient of trailing sphere (ratio to value of single sphere) CD/CD0 and interval L/diameter Dsp of two spheres in tandem arrangement (plots are experimental data of Tsuji et al. [20,21]), and line is our fitting formula

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Fig. 4

Definition of area of calculation

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Fig. 5

(a) Entire mesh chart (No. of cells: 193,572) and (b) mesh chart in view from inlet

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Fig. 6

One example of the photographs of flying ink particles with two noncharged particles and 32 charged particles

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Fig. 7

Electric potential and electric field distribution (deflection-electrode voltage 5.7 kV)

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Fig. 8

Flow velocity distribution and ink-particle position for two noncharged particles (case1: wdo = 19 m/s, and t = 0.004 s)

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Fig. 9

Flow velocity distribution and ink-particle positions for two noncharged particles (t = 0.004 s)

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Fig. 10

Change in ink-particle velocity w in z-direction for two noncharged particles (leading and trailing ones)

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Fig. 11

Photograph of merging of ink particles in case 3, (a) before merging and (b) after merging

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Fig. 12

Flow velocity distribution and ink-particle position for two charged ink-particles (t = 0.004 s)

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Fig. 13

Trajectories on yz-plane for two charged ink particles (leading and trailing ones) for large and small deflections (legends/labels in (a) is common to (a) and (b))



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